The invention discloses a method for purifying and regenerating a
copper element in
quinolinic acid production
wastewater to prepare
quinolinic acid copper salt and belongs to the technical field of
quinolinic acid production
wastewater treatment. The method comprises the following steps: (1) regulating the pH value of
wastewater by using alkali, then slowly adding
sodium sulfide while stirring, detecting the value by using a pH
reagent, and carrying out filter pressing to collect black CuS precipitate; (2) adding the recycled CuS and water into an oxidation reaction kettle, and then executingstirring and adding a
sodium chlorate water solution for oxidation reaction; (3) adding
copper sulfate pentahydrate, recycled
copper hydroxide,
quinoline and
sulfuric acid into the oxidation reactionkettle, dropwise adding the
sodium chlorate water solution, heating the reaction kettle, carrying out heat preservation reaction, then executing cooling after heat preservation, executing crystallizing to separate out
solid, and executing
filtration to obtain a quinolinic acid
copper salt. According to the method, the copper in the wastewater is reduced to below 2ppm, the
utilization rate of thecopper is improved, the waste can also be changed into wealth, and the
discharge problem of high-copper
ion wastewater is solved.